/*
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

#include "RC4.h"

#include <openssl/evp.h>

#if defined(OPENSSL_VERSION_MAJOR) && (OPENSSL_VERSION_MAJOR >= 3)
#include <openssl/provider.h>
#endif

RC4::RC4(uint8 len) : m_ctx()
{
    #if defined(OPENSSL_VERSION_MAJOR) && (OPENSSL_VERSION_MAJOR >= 3)
        OSSL_PROVIDER_load(NULL, "legacy");
    #endif
    m_ctx = EVP_CIPHER_CTX_new();
    EVP_EncryptInit_ex(m_ctx, EVP_rc4(), nullptr, nullptr, nullptr);
    EVP_CIPHER_CTX_set_key_length(m_ctx, len);
}

RC4::RC4(uint8* seed, uint8 len) : m_ctx()
{
    #if defined(OPENSSL_VERSION_MAJOR) && (OPENSSL_VERSION_MAJOR >= 3)
        OSSL_PROVIDER_load(NULL, "legacy");
    #endif
    m_ctx = EVP_CIPHER_CTX_new();
    EVP_EncryptInit_ex(m_ctx, EVP_rc4(), nullptr, nullptr, nullptr);
    EVP_CIPHER_CTX_set_key_length(m_ctx, len);
    EVP_EncryptInit_ex(m_ctx, nullptr, nullptr, seed, nullptr);
}

RC4::~RC4()
{
    EVP_CIPHER_CTX_free(m_ctx);
}

void RC4::Init(const uint8* seed)
{
    EVP_EncryptInit_ex(m_ctx, nullptr, nullptr, seed, nullptr);
}

void RC4::UpdateData(uint8* data, size_t len)
{
    int outlen = 0;
    EVP_EncryptUpdate(m_ctx, data, &outlen, data, len);
    EVP_EncryptFinal_ex(m_ctx, data, &outlen);
}
